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  1.  # 61

    Colocado por: ****Só a pala se os vidros não tiverem controle solar a pala não funciona

    Ou introdução de estores, a que vídro chegou para não penalisar os ganhos de Inverno?

  2.  # 62

    Colocado por: jfsmoreira

    talvez na sua opinião...
    mas quem lhe garante que está correto?

    que eu estou correcto?
    mas eu ainda não argumentei sequer
    só disse que o ponto 1 está errado

  3.  # 63

    Se não arguentas,não arguentas!

  4.  # 64

    Que conclusões tirou daquilo que colocou em inglês?

  5.  # 65

    As mesmas que qq um que o tenha lido...esse e muitos outros.

  6.  # 66

    -uma casa muito bem isolada nao necessita de grande aquecimento e/ou arrefecimento, sendo como tal necessária apenas a compensação de uma forma muito esporádica, logo um sistema de muita inércia como o prh não é o adequado.

    É em edificações muito bem isoladas que um sistema de climatização por inércia funciona bem. Se você isola muito bem a habitação, esta mantém-se climatizada por muito mais tempo, então um sistema tipo prh permite continuamente reforçar as perdas.
    Há muitas zonas do país onde as temperaturas no Inverno, ficam bastante longe de temperaturas amenas.

  7.  # 67

    "Investing so much money in the building envelope and still putting in an expensive radiant floor heating system eliminates the potential for offsetting much of the extra cost in building envelope improvements through savings in the mechanical equipment—one of the key principles of integrated, whole-systems building design. In most highly energy-efficient houses, the same high level of comfort provided by a radiant floor heating should be achievable simply by installing one or two small, quiet, high-efficiency through-the-wall gas heaters or a few short sections of electric baseboard heat. At $1,000 to $2,000 apiece for Rinnai heaters (installed) or a few hundred dollars for electric baseboard vs. $10,000 for a typical radiant floor heating system, savings of $6,000 to over $9,000 would be possible—and that savings could pay for most of the envelope improvements required to bring the heating load so far down that space heating (instead of distributed heat) becomes a viable option."

  8.  # 68

    "The time lag of heat movement through concrete can also be a problem. In a very well-insulated house, that lag time can result in overheating, particularly if there are other sources of heat being delivered to the space, such as passive solar. If a concrete slab is "charged" with heat during the early morning hours and the surface is warmed to the point where it cannot readily absorb solar radiation striking it, that solar heat will more directly heat the air, increasing the risk of overheating.

    The risk of overheating with concrete-slab radiant floor heating systems in very energy-efficient buildings leads some designers to incorporate sophisticated control systems. Rather than a simple room thermostat, many radiant floor designers install control systems that also adjust the circulating water temperature based on outside air temperature and the temperature of the slab. It can also be important to have different zones in a concrete-slab radiant floor heating system—so that less heat can be delivered."

  9.  # 69

    Heat loss into the ground

    With slab-on-grade radiant floor heating systems, there is potential for significant heat loss into the ground. This reduces the overall efficiency of the radiant-slab system. It is ironic that most people want radiant floor heat because they don't like a cold floor, yet there has long been resistance to insulating beneath concrete floor slabs—which would dramatically reduce the cold-floor problem. They solve the problem with an expensive radiant floor heating system (including rigid insulation under the slab) when the rigid insulation alone would solve most of the problem.

  10.  # 70

    Challenges with cooling

    Most radiant floor heating systems cannot provide cooling, and most homes and small commercial buildings are being built today to provide cooling—even in relatively cool climates. This is why forced-air systems are far more popular than hydronic heating systems nationwide—the ducts used for forced-air heating can also be used to deliver chilled air. One of the problems in turning a floor into a heat sink is the risk of condensation on the cool surface. (Condensation occurs when a surface temperature drops below the dew point—which can be quite high in more humid parts of the country.) Radiant cooling (generally with ceiling panels) is used quite commonly in Europe, where humidity levels are generally not as high as in eastern North America and where the comfort envelope of building occupants (the temperature range at which they are comfortable) is wider than here.

    Mas nem todas as regiões da europa se podem classificar com baixos níveis de humidade!

  11.  # 71

    Predicted vs. actual savings

    The final concern with radiant floor heating systems is that much of the assumed energy savings may not be occurring. There is very little hard data to back up the common claim that radiant floor heating systems save a lot of energy because people with this form of heat are comfortable at lower temperatures and thus keep their thermostats lower. In fact a study by the Canada Mortgage and Housing Corporation (CMHC) showed people with radiant floor heating kept their thermostats higher.

  12.  # 72

    A analisar...

  13.  # 73

    Colocado por: jfsmoreiraMost
    some systems dont have those isues, and alredy working in Tugolandia, instaled by me.

    Colocado por: jfsmoreirasave a lot of energy because people with this form of heat are comfortable at lower temperatures and thus keep their thermostats lower. In fact a study by the Canada Mortgage and Housing Corporation (CMHC) showed people with radiant floor heating kept their thermostats higher.
    the main factor is the temperature nedeed is lower, regardless the set point.

  14.  # 74

    Colocado por: jfsmoreirawhere humidity levels are generally not as high as in eastern North Americaand where the comfort envelope of building occupants (the temperature range at which they are comfortable) is wider than here.
    in Southern Europe we have high temperature and high humidity,for example: the user Calinas,

    and the last time we talked (few days ago), no problem reported.



    you should not believe all the xhit found on the internet
    (agora já nem se pode escrever mêrda na lingua dos bifes)

  15.  # 75

    Colocado por: jorgealvessome systems dont have those isues, and alredy working in Tugolandia, instaled by me.

    Acredito que alguns não tenham!



    Colocado por: jorgealvesthe main factor is the temperature nedeed is lower regardless the set point.

    Mas nem sempre isso acontece!


    Resumindo,

    É certo e sabido que nada bate o conforto de um PRH no seu estado normal de funcionamento...mas estas informações atrás não deixam de ter a sua razão.

    Existem situações particulares, às quais eu penso que o PRH perde vantagem... e algumas dessas estão referidas.

    O PRH é bom, mas não é perfeito! Nenhum o é!

  16.  # 76

    Colocado por: jorgealves
    you should not believe all the xhit found on the internet
    (agora já nem se pode escrever mêrda na lingua dos bifes)


    Esta deu para rir...:)

  17.  # 77

    De onde é o calinas?

  18.  # 78

    Colocado por: jfsmoreiraestava confiadíssimo que o PRH era o ideal... instalei... usei... , mas não me convenceu completamente.

    Que parte nao o convenceu no PRH?

  19.  # 79

    Exactamente aquelas que coloquei aqui no topico! Vai ter de ler:)

  20.  # 80

    Colocado por: jfsmoreiraMas nem sempre isso acontece!


    Colocado por: jorgealvesthe main factor is the temperature nedeed is lower, regardless the set point.
    aqui é onde o texto perde credibilidade pois qualquer solução de PRH precisa de muito menos energia que qualquer outra solução e a uma temperatura muito inferior.

    ps: o texto é com as condicionantes de mercado da construção norte americano e logo completamente desfasadas da construção europeia e muito menos do clima mediterrânico.

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